1. POLIMA─Center for Polariton-driven Light–Matter Interactions, University of Southern Denmark, Campusvej 55, Odense M DK-5230, Denmark
2. Department of Physics, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Athens GR-15780, Greece
3. Danish Institute for Advanced Study, University of Southern Denmark, Campusvej 55, Odense M DK-5230, Denmark